Responses
Mother im sorry has something similar you're looking for, although it's not historical and doesn't have the time related concept
https://www.mangago.zone/read-manga/the_villainess_reverses_the_hourglass/
The side stories (epilogue? Idk what they were) at the end are similar to what you described (has been a while since I last read so I'm not sure).
The girl's mother (MC) is suffering after she gave birth to the girl. Girl has powers to go back in time and she tries to persuade her mother not give birth. However that plan failed but dw it has a happy ending
please recommend manhwas where the character goes back in time to save their mother or change the mother's fate so that they don't end up miserable, even if it means that the main character is never born. i remember seeing a tiktok about that a looong time ago and it usually showed recs of those historical manhwas and have been trying to find it, but its been at least a year since I've seen that tiktok